bgar3... Well this confirms the suspicion, look at the second page of the letter. It came from the same player that was looking for a team "A. A. Edmunston" and he once again mentions Esterbrook, this time as "Dude" Esterbrook. He even refers back to to the card he sent in April (Item #15
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Who knows is Esterbrook really trained him or not, but it is interesting that it is "Dude" Esterbrook that he was talking about. Another nail hit on the head!